Table 2b. Limiting Dimensions of ANSI General Purpose Acme Single-Start Screw Threads ANSI/ASME B1.5-1997 (R2014) Nominal Diameter, D 1 ∕ 4 5 ∕ 16 3 ∕ 8 7 ∕ 16 1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8 1 1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 Threads per Inch a 16 14 12 12 10 8 6 6 5 5 5 4 Limiting Diameters External Threads Classes 2G, 3G, and 4G { Max ( D ) 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 Major Diameter Min 0.2450 0.3075 0.3700 0.4325 0.4950 0.6188 0.7417 0.8667 0.9900 1.1150 1.2400 1.3625 Classes 2G, 3G, and 4G Minor Diameter Max 0.1775 0.2311 0.2817 0.3442 0.3800 0.4800 0.5633 0.6883 0.7800 0.9050 1.0300 1.1050 Class 2G, Minor Diameter Min 0.1618 0.2140 0.2632 0.3253 0.3594 0.4570 0.5372 0.6615 0.7509 0.8753 0.9998 1.0720 Class 3G, Minor Diameter Min 0.1702 0.2231 0.2730 0.3354 0.3704 0.4693 0.5511 0.6758 0.7664 0.8912 1.0159 1.0896 Class 4G, Minor Diameter Min 0.1722 0.2254 0.2755 0.3379 0.3731 0.4723 0.5546 0.6794 0.7703 0.8951 1.0199 1.0940 Class 2G, Pitch Diameter { Max 0.2148 0.2728 0.3284 0.3909 0.4443 0.5562 0.6598 0.7842 0.8920 1.0165 1.1411 1.2406 Min 0.2043 0.2614 0.3161 0.3783 0.4306 0.5408 0.6424 0.7663 0.8726 0.9967 1.1210 1.2188 Class 3G, Pitch Diameter { Max 0.2158 0.2738 0.3296 0.3921 0.4458 0.5578 0.6615 0.7861 0.8940 1.0186 1.1433 1.2430 Min 0.2109 0.2685 0.3238 0.3862 0.4394 0.5506 0.6534 0.7778 0.8849 1.0094 1.1339 1.2327 Class 4G, Pitch Diameter { Max 0.2168 0.2748 0.3309 0.3934 0.4472 0.5593 0.6632 0.7880 0.8960 1.0208 1.1455 1.2453 Min 0.2133 0.2710 0.3268 0.3892 0.4426 0.5542 0.6574 0.7820 0.8895 1.0142 1.1388 1.2380 Internal Threads Classes 2G, 3G, and 4G { Min 0.2600 0.3225 0.3850 0.4475 0.5200 0.6450 0.7700 0.8950 1.0200 1.1450 1.2700 1.3950 Major Diameter Max 0.2700 0.3325 0.3950 0.4575 0.5400 0.6650 0.7900 0.9150 1.0400 1.1650 1.2900 1.4150 Classes 2G, 3G, and 4G { Min 0.1875 0.2411 0.2917 0.3542 0.4000 0.5000 0.5833 0.7083 0.8000 0.9250 1.0500 1.1250 Minor Diameter Max 0.1925 0.2461 0.2967 0.3592 0.4050 0.5062 0.5916 0.7166 0.8100 0.9350 1.0600 1.1375 Class 2G, Pitch Diameter { Min 0.2188 0.2768 0.3333 0.3958 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 Max 0.2293 0.2882 0.3456 0.4084 0.4637 0.5779 0.6841 0.8096 0.9194 1.0448 1.1701 1.2720 Class 3G, Pitch Diameter { Min 0.2188 0.2768 0.3333 0.3958 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 Max 0.2237 0.2821 0.3391 0.4017 0.4564 0.5697 0.6748 0.8000 0.9091 1.0342 1.1594 1.2603 Class 4G, Pitch Diameter { Min 0.2188 0.2768 0.3333 0.3958 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 Max 0.2223 0.2806 0.3374 0.4000 0.4546 0.5676 0.6725 0.7977 0.9065 1.0316 1.1567 1.2573
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